JOURNAL OF NATURAL RESOURCES ›› 2019, Vol. 34 ›› Issue (6): 1306-1316.doi: 10.31497/zrzyxb.20190615

• Resource Evaluation • Previous Articles     Next Articles

Variation characteristics of stable isotope in precipitation in Mount Lu area

Qi CHEN1,2(), Jin-rong GUO1,2, Chao LI1,2, Han-kun WANG1,2, Chun-sheng WU1,2,3, Wen-ping DENG1,2,3(), Yuan-qiu LIU1,2,3, Qing YE1,2,3, Xiao-dong LI1,2,3   

  1. 1. College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China
    2. Laboratory of Forest ecosystem Conservation and Restoration in Poyang Lake Basin, Nanchang 330045, China
    3. Mount Lu Forest Ecosystem Positioning Research Station, Jiujiang 332900, Jiangxi, China
  • Received:2018-11-28 Revised:2019-02-19 Online:2019-06-20 Published:2019-06-20

Abstract:

Stable isotope technique is widely used to study the source of water vapor during water cycle, the supply relationship and water balance among different waters. From April 2016 to April 2017, the thesis selects three different sites in the Mount Lu area (Lianhua Town lies to the west of Mount Lu, Guling Town at the top of hill, and Haihui Town to the east of Mount Lu). Based on the isotopic data of 102 precipitation samples collected from the three places, we used linear regression analysis and comparative analysis to explore the temporal and spatial characteristics of hydrogen and oxygen stable isotopes and deuterium excess in precipitation in the Mount Lu area and their influencing factors. The results show that: In the study area, the stable isotope value of δ18O in summer precipitation was lighter than that in winter. The seasonal difference of water vapor source is obvious. The deuterium excess also showed a significant seasonal difference, and the deuterium excess value was higher than that in most parts of the world, being 10.0‰. Compared with the global meteoritic water line (GMWL) δD=8δ18O+10, the slope and intercept of the local meteoritic water line (LMWL) δD=7.45δ18O +8.36 are smaller in the Mount Lu area than in the global meteoritic water line (GMWL) δD= 8δ18O+10. Based on the HYSPLIT model, the atmospheric water vapor in this region is mainly derived from the South China Sea and the Indian Ocean at low latitudes in summer, and the dry inland in North and Northwest China in winter. The influence of local water vapor and geographical location differences lead to the spatial differences of rainfall isotopic characteristics. This study provides a scientific basis for the future study of water cycle in Mount Lu area.

Key words: Mount Lu, precipitation, stable isotope, deuterium excess, HYSPLIT model